Dialectology (from Greek, dialektos, "talk, dialect"; and, -logia) is the scientific study of linguistic dialect, a sub-field of sociolinguistics. It studies variations in language based primarily on geographic distribution and their associated features. Dialectology treats such topics as divergence of two local dialects from a common ancestor and synchronic variation. Dialectologists are ultimately concerned with grammatical and phonological features that correspond to regional areas. Thus the… (More on Dialectology)